1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++98, c++03, c++11, c++14 10 11 // <optional> 12 13 // template <class T> constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept; 14 // template <class T> constexpr bool operator<=(nullopt_t, const optional<T>& x) noexcept; 15 16 #include <optional> 17 18 #include "test_macros.h" 19 20 int main(int, char**) 21 { 22 using std::optional; 23 using std::nullopt_t; 24 using std::nullopt; 25 26 { 27 typedef int T; 28 typedef optional<T> O; 29 30 constexpr O o1; // disengaged 31 constexpr O o2{1}; // engaged 32 33 static_assert ( (nullopt <= o1), "" ); 34 static_assert ( (nullopt <= o2), "" ); 35 static_assert ( (o1 <= nullopt), "" ); 36 static_assert ( !(o2 <= nullopt), "" ); 37 38 static_assert (noexcept(nullopt <= o1), ""); 39 static_assert (noexcept(o1 <= nullopt), ""); 40 } 41 42 return 0; 43 } 44